it has a bigger tank than corolla/civic and gets better fuel economy. It gives 15km/l at 125/130km/hr
I myself drove it from isb to Lahore DHA and back in one tank. 10 hr 30min driving time
2.5 is very efficient while cruising, it goes down to 9/10km/l in traffic or with spirited driving.
it has the comfort of a C class, size of an E class and running cost is similar to civic/ corrolla. No high-octane needed